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Negative electrodes, electrochemical devices and electronic devices

An electrochemical and negative electrode technology, applied in the field of electrochemical energy storage, can solve problems such as puncture and short-circuit risks, and achieve the effect of avoiding short-circuit risks and ensuring safety performance.

Active Publication Date: 2021-11-02
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As charging progresses, lithium ions are intercalated in the negative electrode of the electrochemical device. If lithium intercalation is not timely, lithium precipitation may occur on the surface of the negative electrode, and even lithium dendrites may be formed, which may pierce the separator. , causing a short circuit risk

Method used

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  • Negative electrodes, electrochemical devices and electronic devices
  • Negative electrodes, electrochemical devices and electronic devices
  • Negative electrodes, electrochemical devices and electronic devices

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Preparation of the positive electrode sheet: dissolve the positive active material lithium cobaltate, the conductive agent conductive carbon black, and the binder polyvinylidene fluoride (PVDF) in N-methylpyrrolidone (NMP) at a weight ratio of 97.6:1.1:1.3 solution to form positive electrode slurry. Aluminum foil was used as the positive electrode collector, and the positive electrode slurry was coated on the positive electrode collector with a coating thickness of 50 μm. After drying, cold pressing, and slitting, the positive electrode sheet was obtained.

[0071] Preparation of the negative electrode: Dissolve the negative electrode active material artificial graphite, the porous material mesophase carbon microspheres and the binder styrene-butadiene rubber in deionized water at a weight ratio of 98.2:0.5:1.3 to form the negative electrode slurry. Copper foil with a thickness of 10 μm was used as the negative electrode current collector, and the negative electrode slu...

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Abstract

Embodiments of the present application provide negative electrodes, electrochemical devices, and electronic devices. The negative electrode includes a current collector and an active material layer arranged on the current collector, and the ion conductivity of the active material layer is 0.01S / m to 1S / m. In the embodiments of the present application, by limiting the ionic conductivity of the active material layer to 0.01S / m to 1S / m, the electrochemical device can meet the requirements of fast charging, and at the same time, it can inhibit the electrochemical device from charging under the fast charging condition. Lithium is deposited on the surface of the negative electrode, which ensures the safety performance of the electrochemical device.

Description

technical field [0001] The application relates to the field of electrochemical energy storage, in particular to negative electrodes, electrochemical devices and electronic devices. Background technique [0002] As people's demand for electrochemical devices (eg, lithium-ion batteries) increases, the requirements for fast charging performance and safety performance of the electrochemical devices are also getting higher and higher. As charging progresses, lithium ions are intercalated in the negative electrode of the electrochemical device. If lithium intercalation is not timely, lithium precipitation may occur on the surface of the negative electrode, and even lithium dendrites may be formed, which may pierce the separator. , causing a short circuit risk. Therefore, there is a need to further improve the fast charging performance and safety performance of electrochemical devices. Contents of the invention [0003] The embodiments of the present application improve the fas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/62H01M10/0525H01M10/0567H01M10/42
CPCH01M4/625H01M10/0567H01M10/0525H01M10/4235H01M4/13H01M2004/027H01M4/362Y02E60/10H01M4/386H01M4/664H01M10/0562H01M2004/021H01M2300/0068H01M10/056H01M10/0566
Inventor 江兵王可飞
Owner NINGDE AMPEREX TECH
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